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<h3>计算器-加法</h3>
<form method="get" action="http://127.0.0.1:8080/add">
    操作数1：<input name="num1" type="text" placeholder="num1"><br>
    操作数2：<input name="num2" type="text" placeholder="num2"><br>
    <input value="提 交" type="submit">
</form>
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